Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 221-338-7 | CAS number: 3069-40-7
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2010-07-06 to 2010-07-20
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- The study was conducted in accordance to an appropriate test method and in compliance with ISO 17025 quality system
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 27 July 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 30 May 2008
- Deviations:
- no
- GLP compliance:
- no
- Other quality assurance:
- ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- -66 °C
- Atm. press.:
- 1 013 hPa
- Conclusions:
- A melting temperature value of -66°C at 1013 hPa was determined for the substance using a relevant test method and in compliance with ISO 17025. The result is considered to be reliable.
Reference
Result:
The DSC measurements were performed twice. After cooling to -125°C at a rate of 5 K/min the sample was heated to 35°C at a rate of 10 K/min. The cooling curve exhibits only one sharp exothermic crystallisation peak. Upon heating the heat flow curve shows several small thermal effects (two endothermic maxima at -75/-76°C and -66/-67°C and one exothermic maximum at -72/-72°C, indicating thermal conversions) as well as an endothermic melting with a peak maximum temperature at -62/-62°C and an extrapolated onset temperature of -65/-66°C.
It is to be noted that crystallisation processes are often impaired by supercooling, due to a kinetic delay of the transformation caused by inhibited nucleation. Thus the measured transformation temperature does not necessarily correspond to the thermodynamic equilibrium temperature, but is strongly dependant on the thermal history of the sample and the applied cooling rate. Therefore cooling and heating cycle yield different enthalpy profiles.
Melting temperature: -66°C
The DSC curves are attached
Description of key information
Melting Point: -66°C at 1013 hPa (OECD 102)
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -66 °C
Additional information
A melting temperature of -66°C at 1013 hPa was determined for the substance using differential scanning calorimetry (DSC) in accordance with OECD Test Guideline 102 and in compliance with ISO 17025 quality system. The result is considered to be reliable and is selected as key study.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
